• 한국환경보건학회지
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• 제19권2호
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• pp.40-45
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• 1993

A solvent extraction system of copper-thiocyanate complex into various types of alkylamines such as secondary, tertiary and quaternary ammonium salt for the determination of trace copper by atomic absorption spectrometry is presented. The maximum extraction of copper shows at 0.1 M-thiocyanate and single extraction with 10 ml of 1% amine-MIBK from 50 ml of aqueous solution is enough to be quantitative for micro amounts of copper. The effect of amine diluents and of diverse ions are also examined.

• 약학회지
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• 제39권2호
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• pp.148-152
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• 1995

For comparison between the compromised experimental condition and the best conditions for each element by flame atomic absorption spectrometer, the absorbances were measured with changing the burner height and HCL current. The optimum absorbance for simultaneous analysis of 6 elements was observed at 1 mA of HCL current and at 4 mm of burner height except Cr and Co. The stability of flame atomic absorption spectrometer on each element was found to be better than 5%. To investigated the accuracy of this instrument, POSCO RM-07 as a real sample was analysed at these compromised experimental conditions and found to be better than 0.04%.

• 분석과학
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• 제10권3호
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• pp.179-186
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• 1997

본 연구는 식물체 중 게르마늄을 분석할 때 기존의 방법보다 분석효율이 높고 간편하여 분해시간이 짧게 걸리는 방법을 찾고자 실험을 수행하였다. 시료 분해시 분해액은 $HNO_3+HClO_4+H_2SO_4$의 혼합산을 10 : 4 : 1(v/v)의 비율로 혼합 사용하였을 때 분해 소요 일수는 4~5일이었고, 회수율은 98% 이상이었다. 분해 후 최종 일정 부피로 맞추어 주기 위한 용액은 0.1M acetic acid-sodium acetate가 좋았으며, 아르곤 연료를 사용한 탄소봉원자화기부착 원자흡광분광광도계의 검출 한계는 0.02ppm이었다. 이와 같은 결과들은 식물체 중 게르마늄 분석에 있어서 전술한 실험 목적에 부합되는 결과였다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제22권6호
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• pp.22-28
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• 2017

The accuracy of analytical results in response to the use of different additives ($NH_4Cl$, KCl, $LaCl_3$) and oxidant gases was evaluated and compared by using Atomic Absorption Spectrometry (AAS). Identification of spectroscopic interferences and possible improvements in Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) analysis were also discussed. The average accuracies of total chromium using Certified Reference Materials (CRMs) were found to be 72.1~94.2% in air/acetylene flame condition by AAS, and they were improved to 100.5~110.5% when the oxidants was changed to nitrous oxide rather than adding the additives. The field samples showed similar trends to CRMs, but chromium concentrations were highly variable depending on analytical conditions. The average accuracies using CRMs were estimated to be 89.3~166.1% by ICP-AES, and improved to below 121.7% after eliminating iron interference. Field samples with low chromium and high iron concentration were measured to be > 30% lower in total chromium concentrations by ICP-AES than AAS in nitrous oxide/acetylene flame. Total chromium concentrations in soil could be analyzed with better accuracy under nitrous oxide/acetylene flame by AAS because it was more effective to increase the temperature of the flame than to eliminate the chemical interference for maximizing atomization of chromium. When using ICP-AES, interference substances, total chromium levels, and analytical conditions should be also considered.

• 한국정밀공학회지
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• 제33권9호
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• pp.699-706
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• 2016

Assay of biomolecules based on absorption spectroscopy is a sensitive, minute, quantitative, rapid and real-time process. UV-vis spectrometry has inherent advantages for use in analytical applications. To reduce the consumption of scarce samples, a new generation of miniaturized UV-vis spectrometric systems has been developed. This study determined empirically and through simulations the feasibility of assaying biomolecules by means of UV-vis spectrometry. This paper also reports a fully integrated portable micro-detection equipment system that utilizes a micro-optical path for analysis of micro-volume samples.

• Bulletin of the Korean Chemical Society
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• 제27권6호
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• pp.875-880
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• 2006

A new, simple and fast flow injection analysis (FIA) method has been developed for the indirect determination of nitrite. The proposed indirect automatic method is based on the oxidation of nitrite to nitrate using a lead(IV) dioxide oxidant microcolumn where the flow of the sample through the microcolumn reduces the $PbO_2$ solid phase reagent to Pb(II), which is measured by flame atomic absorption spectrometry. The absorbance of Pb(II) are proportional to the concentration of nitrite in the samples. The calibration curve was linear up to 30 mg $L ^{-1}$, with a detection limit of 0.11 mg $L ^{-1}$ for a 400 mL injected sample volume and a sampling rate of about 80 $h ^{-1}$. The results exhibit no interference from the presence of large amounts of ions. The developed procedure was found to be suitable for the determination of nitrite in foodstuffs and wastewaters. A relative standard deviation better than 0.9% was obtained in a repeatability study. The reliability of the method was established by parallel determination against the standard method.

• 분석과학
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• 제6권4호
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• pp.363-368
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• 1993

흑연로 장치가 부착된 원자흡광분석기를 이용하여 혈중 납 분석을 위한 최적 조건을 검토하고 납 사용 작업장에서 일하면서 직업적으로 납에 폭로되어 온 근로자들의 혈중 납 농도를 측정하였다. 일반 작업장에서 일하는 근로자들과 비폭로 대조군 간의 혈중 납 농도를 비교하고 작업 연한과 흡연 정도에 따른 상관성을 검토하였다.

• 분석과학
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• 제8권3호
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• pp.273-279
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• 1995

납과 카드뮴을 포함하는 여러 가지 농도의 동결건조된 혈액이 외부정도관리 시료로서 제조되었다. 이 시료들은 흑연료 원자흡수분광법(GFAAS)을 이용하여 성능이 파악되었다. 매트릭스 개선제로서 0.1% ammonium dihydrogen phosphate와 0.1% Triton X-100을 사용하여 섭씨 600 내지 650도의 회화온도에서 혈액에 있는 납과 카드뮴의 정량 분석을 위한 GFAAS의 최적 분석조건이 얻어졌다. 제조된 혈액의 균질도와 안정도는 최적화된 분석조건에서 연구되었다.

• 분석과학
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• 제6권4호
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• pp.359-362
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• 1993

원자흡수분광법으로 여러 원소를 동시분석시 최적 조건을 위하여 연료의 종류, 연료의 양 및 버너 높이의 변화에 대해 10가지 원소의 흡광도를 측정하였다. Air-$C_2H_2$를 연료로 과량을 사용하고, 버너 높이가 2mm일 때 최적 흡광도를 나타내었고, 이때 10가지 원소의 상대흡광도의 평균은 73%였다.

• Bulletin of the Korean Chemical Society
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• 제23권12호
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• pp.1719-1723
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• 2002

1,5-diphenylcarbazone was immobilized on sodium dodecyl sulfate coated alumina. The alumina particle was effectively used for collection of mercury(II) and methylmercury cations at sub-ppb level. The adsorbed mercury was eluted with l mol $L^{-1}$ of hydrobromic acid solution. The mercury(II) was then directly measured by cold vapor atomic absorption spectrometry utilizing tin (II) chloride where as the total mercury was determined after the oxidation of methylmercury into the inorganic mercury. The methylmercury concentration was calculated by the difference between the value of total mercury and mercury (II). Mercury (II) and methylmercury cations were completely recovered from water with a preconcentration factor of 100 (for 1 L solution.) Relative standard deviation at Hg L ${\mu}gL^{-1}$ level 1.7%(n=8) and the limit of detection was 0.11 ${\mu}gL^{-1}$. The procedure was applied to spring water, well water and seawater and accuracy was assessed through recovery experiments.